From rra@stanford.edu

____________________________________________________________________________
[ 2232] By​: gbarr on 1998/11/13 03​:12​:37
  Log​: integrate change#2215 from mainline
  set close-on-exec bit on pipe() FDs
  Branch​: maint-5.005/perl
  ! pod/perlfunc.pod pod/perlvar.pod pp_sys.c

is the change that adds​:

#if defined(HAS_FCNTL) && defined(F_SETFD)
  fcntl(fd[0],F_SETFD,fd[0] > PL_maxsysfd); /* ensure close-on-exec */
  fcntl(fd[1],F_SETFD,fd[1] > PL_maxsysfd); /* ensure close-on-exec */
#endif

to pp_pipe_op. I'm not sure what other people use pipe() for, but I was
using it to set up IPC with a child process. I'm guessing this mostly
went unnoticed because most people probably do this with stdin/stdout,
which are exempted from this. Anyway, this change broke PGP​::Sign on _03.

I can go add a call to fcntl() to unset close-on-exec, wrapped in eval in
case the platform doesn't have that stuff (does the import of F_SETFD from
Fcntl via use Fcntl qw(F_SETFD); fail on platforms that don't have it?),
but this would seem to me to be a bit of a big change for the maintenance
release.

--
Russ Allbery (rra@​stanford.edu) <URL​:http​://www.eyrie.org/~eagle/>